View Compilation Error

0_0_39488156_2510.cpp: In function 'void solve()':
0_0_39488156_2510.cpp:58:25: error: expected '}' before 'else'
   58 |                         else{
      |                         ^~~~
0_0_39488156_2510.cpp:55:38: note: to match this '{'
   55 |                         if (last==-1){
      |                                      ^